/Engine/Source/Editor/Sequencer/Public/ISectionLayoutBuilder.h
Sets the section as a key area itself
void SetTopLevelChannel ( const [FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) & Channel, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [UE::Sequencer::FChannelModel](API\Editor\Sequencer\MVVM\ViewModels\FChannelModel) >([FName](API\Runtime\Core\UObject\FName), const [FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) &)> OptionalFactory )